Geoscience Reference
In-Depth Information
Road Class
Length
1
1
0.9
0.9
0.8
0.8
0.7
0.7
0.6
0.6
0.5
0.5
0.4
0.4
0
250
500
750
1000
1250
1500
0
250
500
750
1000
1250
1500
Number of selected strokes
Number of selected strokes
Closeness
Degree
1
1
0.9
0.9
0.8
0.8
0.7
0.7
0.6
0.6
0.5
0.5
0.4
0.4
0
250
500
750
1000
1250
1500
0
250
500
750
1000
1250
1500
Number of selected strokes
Number of selected strokes
Betweenness
1
0.9
0.8
0.7
0.6
0.5
0.4
0
250
500
750
1000
1250
1500
Number of selected strokes
Figure 4:
Plot a series of relationships between the number of selected strokes and the
connectivity of the retained network. The distributions of connectivity by using five
properties
We can see that the retained network is well connected (in most cases, the
connectity values are equal to 1) by using road class, closeness or
betweenness, but it may be disconnected by using length or degree. It is
because that road length is only a geometric property, and no any topological
information within the network is considered by calculating the length.
The number of connections of a given road is considered by calculating the
degree. Thus degree property performs a little better than length. And a
more complex topological infromation, the shortest path within the road
